EM TEST
coupling NX
Manual of operation
V 1.03
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7.2.
Coupling capacitors and decoupling inductances
7.2.1. Burst coupling to capacitive coupling clamp for signal- and data lines
Burst coupling as per IEC 61000-4-4
Coupling
Coupling
all combinations
Coupling capacitor
Supply lines
Common mode all combinations L1, L2, L3, N, PE
33 nF
Datalines
SHV 50
Ω
output to capacitive coupling clamp
7.2.2. Surge coupling
Surge coupling to AC / DC supply lines capacitors and resistors
Standard family
Coupling
all combinations
Coupling capacitor
Coupling resistor
IEC 61000-4-5
Line to line
18 µF
2
Ω
IEC 61000-4-5
Line to ground
9 µF
12
Ω
Decoupling inductances (lines / neutral)
To prevent unwanted voltage drops in the coupling/decoupling networks, the value of the decoupling element
generally must be reduced for coupling/decoupling networks rated at >25 A. The Table below shows the reduced
inductor values per line in function of the rated current.
Current
Line / Neutral
PE
16 A
1.5 mH
200 µH
32 A
0.95 mH
200 µH
63 A
0.68 mH
150 µH
125 A
0.56 mH
150 µH
200 A
0.36 mH
150 µH
For this case, the
“time to half value” of the open-circuit voltage waveform may be reduced in accordance with
Tables 4 and 5 in standard IEC 61000-4-5.
Surge coupling to data lines
Output sockets 4mm banana plugs for testing signal and data lines with DCD -, CNV 50x family